There is an interesting offer for historians of science, in particular those interested in Ireland. You can download a free electronic copy of Charles Mollan’s Its Part of What We Are by requesting it per email from his publishers “science at rds dot ie” with “Mollan book” in the subject line. This is a two volume 1800-page work containing the biographies of 400 Irish scientists from the last four hundred years. If you want to know more about the book there is a review here and the publishers description here.